Tool-gbinding attachment



B. L. MALLORY.

TOOL GRINDING ATTACHMENT.

APPLICATION FILED OCT- 16. I914- Patented Aug. 22, 1916.

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B. L. MALLORY. TOOL GRINDING ATTACHMENT. APPLICATION FILED, OCT. l6, 19H.

Patented Aug. 22,1916.

B. L. MALLORY.

TOOL GRINDING ATTACHMENT.

APPLICATION FILED OCT. 16. I914- 1,195,248. Patented Aug. 22, 1916.

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174 7/5 10/ rzz 104 7/; Q H 105 /I Q 776 B. L. MALLORYL TOOL GRINDING ATTACHMENT.

APPLICATION FlLED OCT- 16. 1914- 1 1 95,248. Patented Aug. 22, 1916.

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BONNIE L. MALLORY,

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OF CLEVELAND, OHIO.

Toot-GRI ING ATTACHMENT. I

' Specification of Letters Patent.

Patented Aug. 22, 1916.

Application filed October 16, 1914. Serial No. 866,932.

and useful Improvement in Tool-Grinding Attachments, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

' This invention relates to tool grinding attachments for abrading devices.

It has for its object to provide aninstrument that can be areadily applied to the stands of practically all types of abrading devices, such as emery wheels, and which will support a tool incorrectjrelation thereto and properly guide the samein its movements during the. grinding operation, whereby an unskilled'perso-n is enabled to perform thework of an expert.

A further object of'my invention is to provide an instrument'of the above nature which will accommodate various kinds and sizes oftools, and which may be used for grinding either right or left hand drills,

- taps, reamers, etc.

In order to obtain a clear-understanding of the principles and operations'of my tool grinding attachment, it will be well to first consider the results sought for.

It is well known to those familiar with the kind of tools wherewith my attachment is adapted for use, that the metal tothe rear of the cutting edge of the tool must recede therefrom. This constitutes what is known in the art as the. clearance of the tool. Therefore the first requirement of the attachmen tiis that it .present'the tool to the abr'ading device at the correct angle, and

guide it properly in its movements across" the abrading surface so as to produce the aforesaid clearance. Now it is essential,

that the amount of clearance vary in ac-' eordance with the density of hardness of S the object upon which the tool is" intended to operate. For example, wlifre the object is very hard, the clearance is comparatively slight in order that there will be enough material left just back of the cutting lip to sufficiently reinforce and strengthen the.

same. Where the object is'comparatively soft, the reverse of this condition is required. Frem this it will be seen that an adjustment is necessary whereby the attachment maybe caused to-produce varying .de-

grees of clearance, as it guides thef'tool in Y lustrated in the accompanying drawings wherein I Figure 1 is a plan view of my tool grinding attachment applied to the stand of an emery wheel, a portion of the stand and a fragment of the wheel being included in said figure; Fig. 2 is a sectional view through the emery wheel stand, and showing the tool grindihg attachment in side elevation, the same being' viewed from the near side of Fig. 1; Fig. 3 is What may be considered a front elevation of the tool grinding attachment as it appears from the emery wheel side, a .portion of the emery wheel stand being shown in section'in said figure; Fig. 4 is .a central longitudinal section through the tool supporting table and adjacent parts of the attachment, the plane of the section being indicated by the line 4-4 of Fig. 1; Fig. 5 is. a horizontal sec- .tionthrough the attachment on the ,line- 5,5- of Fig. Figs. 6 and 7 are a longiing, respectively to the line 88 of Fig. 3-

and the lines 99 and .1010 of Fig. 5; Fig-11 is a perspective 'view of the supporting bracket; Fig. 12 is a similar view of thepost carrier; Fig 13, a perspective of the post; Fig. 14 is a transverse section through the tool supporting-tablaiju'st forward of the rear tool support, and showing the' same 1n 'front elevation (see, line 1414,

Fig. 1 Fig. 15 is a perspective of a tap' supporting device-for use with m'ygrinding attachment; and Fig: 16 is a artial plan view of the attachment, showing the tap supporting device applied thereto, and illustrati'ng the method of grinding a tap.

Taking up. a detaileddescription 'of the invention by'thc use of reference characters, 1 represents thestand of an emery wheel of common type, above which is supported in suitable bearings 2, the shaft 3, to the end of which is attached the emery wheel 4.

' 10 within which is fastened the reduced lower end of an arbor 11, by means of the pin 12. Because of the adjustable connection-between the bar 8 and the lugs 5, provided by the slots 7, said bar-may be moved laterally with respect to the emery wheel stand until the arbor 11 is located substantially in front of the transverse center of the emery wheel 4, where it may be securely held by the screws 6. I

The supporting bracket 15, that is shown in perspective in Fig. 11, comprises a head '16 and a curved arm 17, which extends from one side of one end of the head 16, said arm 17 having a 'split, cylindrical, hollowboss 18 depending from its end opposite the head 16 for application to the arbor 11. By means of a knurled headed-screw 19, which passes freely through a lug 20 and is threadedinto a lug 21, that pro ects from the adjacen-t edges of the split side of the boss 18, the bracket may be firmly clamped to the arbor 11 in any. angular position with respectthereto. Theunderneath side of the head 16 is provided with a dove-tail groove 22 into which extends a screw 23 that has a smooth portion 24 which is journaled within a plate 25, secured to the rear end of the head 16. Between the smooth portion 24 and the threaded portion of the screw, there is a circumferential groove 26 that is contained within a notch formed in the vertical wall 27 of a slide 28 that is guided within a channel 29 formed in the top wall of the. dove-tail groove 22, adjacent the rear end ofthe head 16. Y A stub shaft 30 occupiesa bore-31 which passes through the head 16.

- above-the channel 29, and isadapted to-be oscillated in eitherdirection by its knurled head 32, until the stop 33, which depends from the underneath surface of the head 32,

engages either one of the stationarystops 34 that rises from the head 16. The stub shaft 0 is retained within the bore 31 by a set screw 35 whichpasses through the side.

of'thehead, and the end of which occupies the circumferential groove 36 in the stub shaft. A pin 37 projects from the lower end of the stub shaft 30 and is eccentric with I respect thereto. This pin occupies a transa correspondingly shaped lug 40 which rises from the lateral arm 41 of the post carrier 42, shown in perspective in Fig. 12. The lug 40 is tapped at 43 for the reception of the screw 23. Upon the turning of the screw 23, therefore, the post carrier 42 will be moved longitudinally of the head 16, or both the screw and post carrier may be re ciprocated through the operation of the stub shaft 30. The purpose of the adjustments thus provided will become apparent later on in this description.

The body portion of the post carrier 42 comprises a hollow cylindrical boss 44, for the reception of. the lower end of the post 45 which, it will be seen upon referring to Fig. 13, particularly, has a head 46 that is provided with a horizontal guideway 47 A transverse boss 48 rises from one end of the top, and a similar boss 49 depends from the opposite end of the bottom of the head 46, for a purpose which will becomeapparent later on; A stop collar 50 and a thrust collar 51 are adapted to be fastened, in any adjusted position, to the post 45 by means of their respective set screws 52 and 53. The stop collar-50 has its lower half cutaway through substantially 180, as shown in Figs. 3 and 8 each end of the cut away' portion forming a shoulder 54 which is arranged to engage a stop pin 55 that is journaled within a vertical bore 56 of the boss 44. The lower end of the stop pin 55 protr'udes beyond the bottom plane of the aforesaid boss and is there provided with an operating handle 57, whereby said pin may be turned. It will be observed, particularly from Fig. 8, that the upper end of the pin has a flattened side 58 that is adapted to be engaged by one of the shoulders 54, when the pin is turned so as to present the fiattened side thereto. Otherwise the said shoulder 54 strikes against the curved side of the pin. The reason for the adjustment of the collars 50' and 51 upon the post. 45,

and the eccentricity of the upper end of the pin 55 will be explained hereinafter.

Slidable within the guideway 47 of the head 46, that is carriedby, and preferably formed integral with the .upper end of the post 45, is a slide orblock 60 which has an enlargement 61, that overhangs the edges of the guideway 47 on the inner side of the head, and' which has applied to its, outer.

face, a plate 62, which maintains .the block '60 straight within-the guideway by bearing upon the outer face .of the head 46, along each edge of the guideway.

isi

Journaled within a transverse bore 646-]? the block 60, is a hollow rock-shaft or sleeve I 65, which has attached to its outer end a link 66, and to its inner end an arm 67. The link and arm are prevented from turning upon the ends ofthe sleeve 65, by the pins 68 which pass downward through the respective arm and link and occupy straight transverse grooves in the side of the sleeve 65. When the arm 67 is rocked, therefore, the link 66 will be rocked likewise. The rear end of the link 66 carries a pin 69 a portion of whidh occupies an aperture 70 in the link 71. The links 66 and 71 are of substantially the same size and shape, and the forward end of the link 71 has an aperture 72 which, when the links 71 and 66 are parallel, is in axial alinement with the sleeve 65 whereon the link.66 is mounted, and about which said link oscillates. The cylindrical head of a screw 73 occupies the aperture 72, and said screwis adapted to be locked at any desired point along a diagonal slot 75 of a plate 76, which is supported by the screws 7 7 and 78 that are threaded into the bosses 48 and 49 of the head 46', the plate being spaced from the side of the head by the spacers 79. The locking of the screw 73 within the slot 75 is effected by a thumb nut 80, that is threaded upon the screw and between the inner face of which and the adjacent surface of the plate 76, there is a washer 81, havin a-tongue 82 which projects into the slot -5, thereby preventing the washer from turning upon the screw. The tongue 82 is formed by cutting material away from each side thereof and thereby producing straight edges 83 on the washer adjacent each lateral edge of said tongue, and one of these straight portions is adapted to coiiperate with the graduations 84: that extend along one side of the slot. Y

Secured to the rear end of the arm 67, )by means of the screws 85, is a curved supporting member 86, whichterminates at its lower end in a horizontally disposed flat circular boss 87. As will be seen most clearly from Fig. 4, this boss is provided with a central vertical bore 88 through which exend of -what I will term a turret 90, prefer tends a stud 89 that is attached to the lower ably by having its upper end-reduced, and threaded thereinto. The lower end of the turret 90 is circular and has a smooth underneath surface for engagement with the smooth upper surface of the boss 87, and the turret is adapted to be clamped to the boss 87, in any adjusted angular position with respectthereto, by the knurled nut 91 co which is threaded upon the lower end of the stud 89, and is arranged to bear against the underneath side of the Boss 87. The rela- -tive angular position of the turret, with respect to the boss 87, is indicated by the index'mark 92 of the turret and the gradu- 'rail 99 that is dove-tail shape in cross secations 93 that are borne by the adjacent edge of the boss 87.

The stud 89 has a central bore that is threaded for the reception of an adjusting screw 94 which extends up through said stud into the guideway 96 of the turret. A tool supporting table 97 is supported by the turret 90 and 1s slidable within its guideway 96, the sides of the table having vertical channels 98 for coiiperation with the sides of the guideway 96. The table rests upon the upper end of the adjusting screw 94 and may be reciprocated within the guideway by the turning of said screw. A

tion, extends longitudinally along the upper side of, and is preferably formed integral with the table 97 and serves as means of' attaching the front and rear tool supports 100 and 101, respectively, to the table. The forward tool support 100 comprises the body portion to which the numeral 100 is applied and has a bore 102 for the receptionof a bushing 103 that is held in place by means of a set screw 104. Bushings of various internal diameters are intended to be used in connection with the tool support, to. accommodate drills of corresponding diameters. The bottom of the body portion 100 is provided with a dove-tail channel for cooperation with the rail 99, and the support is adapted to be locked in different adjusted positions therealong by the screw 106, which is threaded through the side of the support. The body portion of the rear tool support 101 isquite similar to that of the forward tool support, the same having a dove-tail channel for cooperation withthe rail 99. The support 101 may be locked to the rail by means of the set screw 107, which passes through the side of the body portion of the support, near its lower edge, as clearly shown in Fig. 9, a block 108 of comparatively soft material, such as brass, being interposed between the end ofthe screw and the side of the rail, to prevent marring the latter. This same idea is carried out in connection with the screw 106 of the forward tool support, and in other parts of the mechanism, where such is desirable. The central bore 109 of the rear support contains a bushing 110.having a tapered bore 111 for the reception'of a shank of a drill. The forward end of the bushing is provided with a lateral flange 112 which bears upon the front end of the body portion of the support, and

the rear'end of the bushing isthreaded for the application of a nut 113, whereby the bushing is-retained within the bore of the support. As will be observed particularly from Figs. 4 and 5, the extreme rear end of the bushing 110 is" provided with. a tapered thread for the application of the knurled nut 114, and this end of the bushing, it ,will be noted, issplit at 115. By this means, the shank of a drill may be securely clamped within the bushing.

Although my attachment is adapted to the sharpening of all kinds of boring tools, I

have shown it herein as Supporting what is generally known as a high speed drill, the

same comprising the helical portion 116 andthe tapered shank 117 which are separated bya collar 118. In this type of drill, the shank and collar are usually formed of an integral. piece of material, and the twisted to accurately sharpen drills of this character, although by the use of my improved attachment absolute accuracy may be obtained, and the operation reduced to one of.

extreme simplicity. It will be further stated that high speed drills of the above character are made with either two, three, four or six cutting lips, the one shown herein having but two. 7

-I have previously stated that the shank of the drill may be firmly clamped within the'bushing 110, and it isclear' from the con struction of the rear tool support that the bushing 110 is rotatable therein. It will be observed that the lateral flange 112 of the bushing is provided with a series of apertures 120 for the reception of the forward reduced end of a plunger 121 which 'is contained within a bore 122, formed in the top wall of the support 101,-and is pressed toward the aforesaid flange 112 by a spring 123, the plunger being provided with a knob 124: whereby it may. be retracted against the tension of the spring and withdrawn from the apertures 120 of the flange. From Fig. 1 1 it will be seen that there are siX apertures 120, and that two diametrically op'positeones bear the numeral 2. These are used. when operating upon a drill having two lips. The bushing is set with the plunger occupying one of the apertures marked 2 and the shank of the drill is clamped'within the bushing with one of' its lips horizontal, which is the proper position for grinding. When the first lip has been treated, and it is desiredto grind the other, the plunger 124'is withdrawn from the aforesaid aperture and the drill is; rotated until the other aperture marked 2.

is in register with the plunger 121, when said plunger will be projected into the aperhire to hold the parts in position forthe grinding of the second lip. It will be seen from this that both lips will receivepre cisely'the same treatment, and that the line of demarcation between the two must be coincident with the rotating axis of the these drillsv reception of the end of said plunger. It

drill. When operating upon drills having three lips, the apertures 120 which are correspondingly marked are used, and likewise when grinding drills having four or six lips. An operating handle or knob 125 is shown as attached'to the rear end of the table 97 for a purpose which will be brought out during the description of the operation of the attachment. I

Carried by the turret 90, on each side of its guideway 96, is a sleeve 130 which extends through the turret and projects some distance forward therefrom. These sleeves are adapted to receive the shank 131 to a gage finger 132 which is used for determining the correct location of the lip of the drill that is to be ground. In Fig. 5, this i gage finger will be seen as overlying the lip of the drill, and its-shank is provided with a series of graduations 133 which cooperate with the forward end of the respective sleeve 130 to determine the correct position of the gage with respect to the turret. A keyway 134 is formed in the side of the shank 131 and receives what is, in effect, a key 135, the same being preferably formed by forcing a portion of the material of the sleeve 130 inwardly, -such portion being of substantially the same width as the *keyway 134:. By this means, the gagefinger is prevented from turning with respect to the sleeve and assures the correct adjustment of the drill.

While setting a drill or other tool for the purpose of grinding the same and adjusting the-various parts prior to the operation of the mechanism, the tool supporting table is maintained in a horizontal position by looking means which comprises the slide bolt 136, shown in detail in 10. This bolt is reciprocable-within a transverse bore 137, formed in the lower "rear corner of the en.- large'ment 61 of the block 60, and when the parts are in the aforesaid position the end of the bolt occupies a recess 138 that is formed in the arm 67. The bolt is held its inner'or outer position-by means of a spfing plunger139 which occupiesa vertica having circumferential grooves-141 for the will be noted that the opposed sides of the two grooves are substantially perpendicular to the longitudinal axis of the bolt, -'while the bottoms of said grooves 'are inclined at a comparative'fi' 'slight angle with respect. thereto, and merge at the adjacent SidQS -HItO the outer surface of the bolt. By this ar-. rangement, the bolt can be easily moved so as to bring either of its grooves into re "ster with the plunger, but in the case: 0 the groove nearest the end" of the plunger, its

straight side will engage the plunger and revent the entire withdrawal of the bolt om the bore 137 The purpose of thesec- 0 bore 140 in the enlargement 61, the bolt 45 is thereafter adjusted vertically within its carrier 44 until the lip of the drill is, slightly (approximately one sixteenth inch,

.1n practice) above the horizontal center of the abrading wheel. The post ismaintained at this elevation by locking'the thrust collar 51 to the post, by means of its set screw 53. The post is then set within its carrier so that its headwill be in substantially a parallel plane with-the wheel. The stop collar 50 is now rotated upon the post 45 until one of its shoulders 54 is in engagement with the pin 55, the latter being turned so as to present its flattened side 58 to such shoulder. In this position the collar is securely locked to the post by means of its set screw 52. Care should be taken in the collar to have the cut away side thereof facing in the direction of the emery wheel, so that the post 45 may turn within the carrier 44 in a direction to remove the drill from the abrading Wheel. With the parts thus adjusted, the turret 90 may now be rotated upon the supporting member 86, until the appropriate one of the graduations 93 is selected by the index 92, to .indicate that the lip of the-drillwill be parallelto the working surface of the abrading wheel when the same is swung thereagainst. In this position the turret is clamped by the nut 91.

j Attention is called to the fact that the tool supporting l able and the head 16 of the supporting bracket; should be substantially parallel, as shown in Fig. 1; and that the head46 shouldbe substantially parallel to the plane of the abradingwvheel, as aforesaid.-

With the parts adjusted as above described the operation is as follows :-The operator grasps the knob 125 and withdraws the bolt 136 from the arm 67. He then swings the rear end of the tool supporting table up and down, whichrocks tfiie arm'67, by reason of 'its connection therewith through the sup porting member 86 and the turret 90. Upon the-rocklng of the arm 67, the link will be caused 'to 'rock in like. manner, because of' its connection with thearm through the sleeve. 65. Also, the downward movement of the rear end of. the link 66 will cause a similarmovement ,ofthe link .71 upon its pivot or screw 73; biltbecause of the fact the adjustment of eration is taken ,,clearance portions of the that the screw 73 occupies a position above the plane of the sleeve 65, the arcs described by the rear ends of the links 66 and 71 will have difi'erent centers, the center Whereon the link 71 rotates being defined by the screw 73, while that upon which the link 66 swings is defined by the sleeve 65. Since the rear ends of the links 66- and 71 are positively pivoted together by means of the pin 69, the swinging of the links will result in the link 66 being moved bodily forward, whereupon the block 60' will be slid within the guideway 47, and all of the parts carried thereby will be moved in the direction of the abrading wheel. It will be obvious from this that the clearance of the drill is obtained' by this advance movement of the drill toward the abrading surface while the same is being oscillated upon the axis defined by the center of the sleeve 65, which axis, it will be noted, is parallel to the abrading surface. To adjust the drill forthe sharpening of its other lip, the table may be returned to its horizontal position and held there by the bolt 136, and the parts may be moved away from the abrading wheel by swinging the post 45 within its carrier 44. After the plunger 121 has been withdrawn from the apertu e within the flange 112 and the drill had been turned over until the plunger is brought in position to occupy the opposite aperture there of, the parts may be moved again toward the abrading device until the shoulder 54 of the stop collar engages the pin 55, after which the operation above described is repeated.

. It is known to those familiar with the deward and, in the operation of the drill, bears 11o directly against the object that is to be acted .upon by-the drill. Itis obvious thatthis bearing of the point of the drill upon the object results in inefiiciency in the operation of the ill,which is estimated to be substantial that of seventy-five per cent. In

other words, seventy-five per cent. of the power which is consumed in the drilling opp in forcing this dead point of the drill into the beenv the practice heretofore in the sharpening of drills by hand, to ignore this Idetris mental feature,

the grinding away of the inner parts of the drill in order material. It'has I although the same may be obviated by spotting? the point of .the By spotting the point of the drill is meant 12a to cause the line' which divides said portions to, curve inward rather than outward, as

formerly described. This leaves the extreme 18o I m y provide the stub shaft 30, which may be detrimental feature. I have incorporated within my attachment means for accomplishing this same result of spotting the.

point of the'drill.

In the operation of spotting the drill, the slide bolt 136 is withdrawn from the recess 138 of the arm '67, and said arm, with the parts carried thereby, is permitted to drop until the recess 142 is in register with said bolt, when' said bolt may be returned to effective position and hold the parts in such position. This swings the drill upon the center defined by the sleeve 65, until the central part of the clearance portion of the drill issubstantially horizontal or in a position to be presented to the abrading surface. The stop pin 55 is next turned by means of its operating handle 57, to bring its curved side opposite the shoulder 54 of the stop collar. This prevents the parts from swinging quite as far in the direction of the emery wheel as they previously did and, at thesame time changes of the drill and the 'abr'ading surface. Now

the angle between the lip in order to move the drill supporting parts toward the abrading wheel so that the drill be brought into contact therewith, I

turned by its head 32, and move the slide 28, the screw 23, and the post carrier 44, with all of the parts supported thereby, bodily toward the abrading wheel. Now as the parts are rotated with the post 45 toward the abrading Wheel, the clearance portion of the drill will be brought into contact with the abrading surface, at an angle which will cause only its inner part to be efiected, and thereby concave that portion of the drill on an arc corresponding to the circumference of the wheel. When both clearance portions are so treated, theline dividing them will curve inward as desired.

I have previously referred to the device for application to my attachment, that is 4 which pro ects a cylindncal boss 151, and

used in the grindin of taps. as will be seen clear y from Figs. 15 and 16 comprises a trough 150 from one side of from the other side of which rises anarm 152 which overhangs the; trough 150, and through the upper, horizontal portion of which is threaded a set screw 153. The shank of a tap 154 may be clamped within thetrough 150, by means of the screw 153, the lower end of which is brought to bear directly against the shank of the tap. The

trough is applied to the attachment by means of the boss 151 which is placed within the bore 152 of the front tool support. 100 and is held therein by the set screw 104. To properly adjust the tap with respect to the center of thesleeve 65'whereon the tap oscil- This device,

lates, I, provide a point 155 that may be slipped into the sleeve 65 and held therein by a set screw 156 in a position to be engaged by the centerof the end of the tap. To gain this position, it .is obvious that the .tool supporting table may be adjusted by -the screw 94 until the proper elevation is ob- ,tained, and that the tap may be. adjusted longitudinally within the trough 150, prior to-thetightening of the'screw 153. Just before thetightening of this. latter screw, the tap is also adjusted toits proper angular position within the trou h, which may be determined by a gage nger 157 that is placed within one of the sleeves 130, the for-. ward end of the gage finger 157 havingits underneath side flattened for cotiperation with one of the flutes of the tap. The tur-' ret 90 is swung upon the supporting member 86 until the side of the tap is at the proper angle to the abrading'surface, which represents the oscillation .of the table 97,. the tap will be presented to the abrading wheel and guided in its movements across the same in a manner that will produce the desired clearance, in the same manner as has been previously explained in connection with the grinding of a drill. I

My attachment is shown in the drawings as being arranged for the" sharpening of right-hand drills and.taps. To change it the lead desired. Now, upon for. the grinding of left-hand drills, taps,

reamers, etc, the supporting bracket is loosened from the arbor 11 and is swung about the same until the head 16 thereof occupies a position on the opposite side of the abrading wheel corresponding to that which it occupies in the drawings. The

screw 23 is then rotated to support into substantially the same position, with respect to the .abrading wheel, as it formerly occupied on the opposite side'thereof. The supporting member 86 is detached from the arm 67 85,. and the block 60, with the parts carried thereby, are removed from-the guideway 47 and are turned over and replaced withm the guideway with the arm 6 extending 1n a direction away from the precisely as they did in the former mstance.

The supportingmemberBG is ;tur ned to the opposite side 0 the turret 90 and is attached to the arm 67. Thus assembled, the mecha- J nism is in readiness to operate withleft attachment for abradsurface, a tool support, pivotally connected therewith, a link, a pivotal support for one end of the link which is adjustable transslide the post 5 by the removal of the screw 1 o abrading wheel, 15

ination of a member versely of the direction of movement of the-13c transversely v abradingdevices, the combination of a mem abrading surface,

, tionary aforesaid plate,

and the aforesaid first mentioned member,and connections between the tool support and the free end of.

said link whereby the oscillation of the support will cause said link to move ,the first mentioned member.

12. In a tool grinding attachment for' that is pivoted to the free end of the former link, and a pivotal support for the opposite end of the latter link which is adjustable tion of the tool carrier to move themember.

3. In a tool grinding attachment for abrading devices, the combination of a member movable toward and away from the abrading surface, a rock shaft carried thereby, .an arm rigid withsaid rock shaft, a supporting member carried by the arm, a tool support carried by the supporting member, a link rigid with the aforesaid rock shaft and extending therefrom in the directionv of theaforesaid arm, a second link having one of its ends pivoted to the free end of the first'mentioned link, 'and a pivotal support for the opposite end of the-second link that will "cause said links is adjustable'transversely of the direction of movement of the first mentioned member.

4. In a tool grinding attachment for ber having a guideway, a slide movable therewithin toward and away from the a rock shaft supported by said slide, a supporting'member rigid with said rock shaft, a tool support carried by the supporting member, a link rigid with the afores id rock shaft, a pivoted tithe free end of the former link, and a'pivotal support for the opposite end of the latter link which is adjustabletr'ansyersely of the direction ofmovement of the aforesaid slide.

[5. In a tool grinding attachment for abrading devices, the combination-of a sta member having a guideway, that is stationary with respect to said member and having a slot longitudinal axis of the guideway a slide movable within the guideway toward and porting member pivoted to the'slide, a pivot that is adjustable within the slot of the a' link having'one of its upon the pivot, and oonthe. free end of the. link tool supporting member whereby the oscillation of said effect a movement of the slide.

,6. In a' tool grinding attachment for ends fulcrumed nections between of the direction of movement of the aforesaid member whereby the oscillaaxis of the fond link having one of its ends link remote from the first link being fulcrumed upon the pivot,

second link that is of the guideway,

mg surface,

a plate.

which is oblique to the supporting member will abrading devices, the combination of a member having a guideway, a plate that is stationary with respect to said member and is spaced therefrom and having a slot that is oblique with respect-to the longitudinal axis of the guideway, a slide movable within the guideway toward and away from the abrading surface, a rock shaft supported by said slide, a link having one of its ends pivotally connected to the free end of the first link, a pivot adjustable alongthe aforesaid slot, the end of the second link remote from that attached to the first link being fulcrumed upon the pivot, and a tool supporting member angularly fixed with respect to the rock shaft.

7. In a tool grindin attachment for abrading devices, the com ination of a member having a guideway, a plate that is stationary with respect to said member and is spaced therefrom and having a slot that is oblique with respect to the longitudinal guideway, a slide movable within the guideway toward and away from'the abrading surface, a rock shaft supported by said slide, a link rigid therewith, a secpivotally connected to the free end of the first link, a pivot adjustable along the aforesaid slot, means for locking the same in any adjusted position therealong, that end of the second one attached to the rigid therewith, a second link an arm rigid with the aforesaid rock shaft on the side of the slide opposite the first mentioned link,

and a tool support carried by the supporting member. v

8. In a tool grinding attachment for abrading devices, the combination of a member having a guideway, a plate that is stationary with respect to said member and is spaced therefrom and having a slot that is oblique with respect to the longitudinal axis a slide movable within the and awayfrom the abrada rock shaft supported by said slide, a link ,rigid therewith, a second link having one of its ends the free end of the guideway toward firstlink, a pivot adjusta supporting member secured to said arm,

pivotally connected to able along the aforesaid slot,means for locking the same in any adjusted position-therealong, the end of thesecond. link remote,

from that attached to the first link being fulcrumed upon the pivot, an arm: rigid with the aforesaid rock shaft on the side of the slide opposite the'first mentioned link, a member secured to said arm, a tool supporting device swiveled to the supporting. member, and means for locking said device against supporting member.

9. In a tool grinding attachment 'for abrading devices,- the combination of a memmovement with respect to the ber having a guideway, a slide'mov'able within the guidway toward and away from the abrading surface, a supporting member pivoted to the slide, a turret rotatably supported by the supporting member, means for locking the same against movement with respect thereto, a tool support carried by the turret, and connections whereby the oscillation of the supporting member will cause reciprocation of the slide.

'10. In mechanism of the character set forth, the combination of a supporting member havin a substantially vertical bore, a. turrethaving a stud that occupies said bore, means whereby .the turret may be locked against move'mentwith respect'to the supporting member, the turret having a vertical guideway that is in substantial alinement with the axis of the aforesaidstud, an adf justing screw that is threaded upward through the stud and projects into the ideway," and a tool support slidablewith n the guideway and resting upon the end of the adjusting screw.

11. In mechanism of the character set forth, the combination of a supporting member having a substantially vertical bore, a turret havmg a stud that occupies said bore, the lower end of which is threaded, a nut for application thereto whereby theturret may be locked against movement with respect to the supportlng member, the turret having a vertical guideway the central axis of WhlCh is substantially coincident with the axis of the aforesaid stud, an adjusting screw that is threaded upward through the stud and projects into the guideway, a tool support slidable within the guideway and resting upon the end of the adjusting screw, and means for attaching a gage finger to the turret on either side of its guideway. 12. In mechanism of the character set forth, the combination of-a supporting member, a turret swiveled thereto and having a' vertical guideway, .a tool support slidable within the guideway; means for supporting the'same at any elevation therein, and means for attaching'a gage finger tothe turret on each side of'its guideway, said means comprising a sleeve 'havinga key for cooperation with a ke way in the gage finger.

13. In mec anism ,of' the character set forth, the combination of a supporting member, a turret swiveled thereto and having a vertical guideway, a tool supportslidable within the guideway, a sleeve carried by the turret, a gage finger having a. shank that is adapted to be receivedthereby, and means for preventing angular movement of ther gage finger within the sleeve. I

14. Inmechanism -of the ch aracter described, the combination of a tool supporting table, front and rear tool'supports that are movable alongtsaid table, means for locking said supports'to thetable, the two sup ports havingbores which are in axial ,alme

to said tool support.

guideway towar wheel, a supporting memb ment, a bushing that is adapted to be re 1 ceived by the bore of the front support, a bushing rotatable within the bore of the rear support, means for locking the latter bushing in various angular positions with respect to the support, and means for clam'ping the shank of a drill within'said bushing.

15. In mechanism of the character described, the combination of a table having a longitudinal rail upon its upper surface, a front and a rear tool support movable along said rail, means for locking each tool support at any adjusted position along the M11, each of the supports having a bore which is in axial alinement with the bore of the other, so a bushing for insertion in the bore of the front support, a bushing rotatable within the bore of the rear support and havin a lateral flange which overhangs the end of the support adjacent its bore, said flange being provided with a series of apertures, a plunger movable longitudinally with respect to the support and arranged to beprojected into any one of the aforesaid apertures, and means for clamping the shank of a drill within the bushing.

16. In mechanism of the character described, the combination of a tool supporting A table, a front and a rear 'tool support movable therealong, each of the supports having a bore which is in axial alinement with the bore of the other, a bushing for insertion in the bore of the front support, a bushing rotatable within the bore of the rear support and having a lateral flange which-overhangs the end of the support ad acent its bore, said flange being providedwith a series of apertures, and a plunger movable longitudinally with respect to the support and arranged tobe projected into'any one of theaforesaid apertures.

17 In mech'anism' of the character described, the combination of a member 'having a guideway, a slide movable within the guideway toward and from the abrading device, a supporting member pivoted to said slide, a pivot adjustable transversely of the direction of movement of the slide,

.-means for locking said pivot in a stationa ary position with respect to the member having the guideway, a link fulcrumed upom the pivot, connectionsbetween the aforesaid supporting member and the free end of the link whereby the oscillation ofthe former will rock the latter andthereby impart ,reciprocatory movement. to the slide, a tool support carried by the supporting member, and means for attaching a tool 18. In mechanism of the character de--. g5

scribed, the combination of a member having a guideway, a slide movable withinthe d and from the abrading er pivoted to. said guide, a pivot adjustabletransversely ofthe n l' direction of movement of the slide, means supporting table adjustable. within the guideway, and means for attaching a tool to said table. j

19. In mechanism of the character set forth, the combination of "a supporting bracket having a head that is arranged to be clamped in a fixed position with respect to the abrading surface, a carrier supported by and movable with respect to the head obliquely toward and from the abrading surface, a slide reciprocable'with respect to the head, means, for operating said slide, adjustable connections between the slide and the aforesaid carrier, a member rotatably supported by the carrier and having a guideway and an abutment, an adjustable nal axis of the channel, a screw tha eccentric stop on the carrier that is adapted tov be engagedby said abutment,- a slide movable within the guideway, a supporting member pivoted thereto, a tool support carried by the supporting member, and means for locking the supporting member in various angular positions with respect to the last mentioned slide.

20. In mechanism of the character described, the combination of an arbor that is adapted to be supported in front of the abrading surface, a supporting bracket rotatablymounted thereon", means for looking said bracket in various angular positions with respect to the arbor, said bracket having a head, a channel within said head, a carrier having a block reciprocable within said channel, the channel and lock being of corresponding cross-sectional shapes and such as will prevent the lateral removal of the block, the carrier having a vertical bore, a slide reciprocable with respect to the head and in a direction parallelto the longitudi threaded through a portion of said slide and through the block of the carrier, means for shifting the slide longitudinally, an eccentric stop pin supported b the carrier, a post revoluble within the ore of the carrier, a stop collar that is arranged to be locked to said post and having a shoulder for cooperation with the eccentric stop pin, means for oscillating the stop pin, a thrust collar for application to the post above the stop collar and adapted to bear thereon, the post having a head that is provided with a guideway, a plate spaced from one of the side faces of the head and rigidly attached thereto, the plate having a slot which is oblique to the longitudinal axis of the guideway, a pivot adjustable within, said slot, means for locking the pivot in any adjusted position therealong, a slide within the guideway movable toward and from the abrading surface, a rock shaft jour'naled Within said slide, an-arm pinned to one end of ,said rock shaft, a link pinned to the opposite end thereof and projecting therefrom in substantially the samedirection as the aforesaid arm, a second link that is pivoted to the free end of the first link and having its end opposite to such pivotal connection fulcrumed upon the aforesaid pivot, a supporting member attached to the free end of the arm, and projecting downwardly and laterally therefrom, a turret swiveled to the lower end of said supporting member, said turret having a ver-- tical guideway, means for locking the turret to the supporting member in any angular position with respect thereto, a tool supporting table reciprocable within the guideway of the turret, means for supporting said table at various elevations within the guideway, means for attaching a tool to the supporting table, andmeans for locking the aforesaid arm to the last mentioned slide in various adjusted positions.

' In testimony whereof, I hereunto aflix myo signature in the presence of two witnesses.

BONNIE L. MA-LLORY.

Witnessesz BRENNAN B. WEST,

. HUGH B. MoG1L 

